*{
    padding: 0;
    margin:0;
}

.box{
    width: 900px;
    height: 900px;
    background: black;
    margin:20px auto;
    padding-top: 20px;
}

@keyframes hueRotate{
    0%{
        filter: contrast(15) hue-rotate(0);
    }
    100%{
        filter: contrast(15) hue-rotate(360deg);
    }
}

.number {
    color: white;
    width: 200px;
    height: 200px;
    text-align: center;
    line-height: 200px;
    position: relative;
    top:10%;
    left:50%;
    margin-left: -100px;
    z-index:9;
    font-size: 40px;

}
.intro{
    color: white;
    width:600px;
    height: 200px;
    text-align: left;
    line-height: 30px;
    position: relative;
    top:21%;
    left:30%;
    margin-left: -100px;
    z-index:9;
    font-size: 30px;

}


.circle{
    width : 300px;
    height: 300px;
    background: #000;
    position: absolute;
    left:  50%;
    top:10%;
    margin-left: -150px;
    filter : contrast(15);
    filter:blur(1px);
    animation:circleRotate 5s linear infinite;
    border-radius: 50%;
}

.circle::before{
    content :"";
    width : 200px;
    height: 200px;
    background:#00ff6f;
    position: absolute;
    top:50%;
    left:50%;
    transform: translate(-50%,-50%);
    border-radius: 42% 38% 62% 49%/45%; 
}

.circle::after{
    content :"";
    width : 176px;
    height: 177px;
    background:black;
    position: absolute;
    top:50%;
    left:50%;
    transform: translate(-50%,-50%);
    border-radius: 50%;
     
}

@keyframes circleRotate{
    0%{
        transform: rotate(0);
    }
    100%{
        transform: rotate(360deg);
    }
}

button{
    width : 40px;
    height: 30px;
    background:#00ff6f;
    bottom:10%;
    margin-left: 50px;
    border-radius: 4%;
}
